The White House says anti-government protests in Egypt are an opportunity for President Hosni Mubarak to demonstrate his willingness to listen to his citizens and make "necessary" political reform.

Obama spokesman Robert Gibbs says the U.S. believes the Egyptian government is stable. He called on all parties to refrain from violence.

Tens of thousands of people have filled the streets of Cairo and elsewhere in the country in the largest anti-government protests in years. Demonstrators are calling for Mubarak's ouster after 30 years in power.

Facebook, Twitter and Blackberry Messenger services have been interrupted, possibly a move by authorities to hamper protesters from organizing.

Egypt's ruling party says it is ready for a dialogue with the public but offered no concessions to address demands for political change.